Ncert- class 6- science-Chapter 11: Air Around Us 1 Welcome to your Ncert- class 6- science-Chapter 11: Air Around Us 1 1. The correct ascending order of gases as per their composition in air is: oxygen < carbon dioxide < nitrogen nitrogen < hydrogen < oxygen hydrogen < oxygen < nitrogen oxygen < carbon dioxide < hydrogen None 2. John finds that, as he blows air into a balloon, it becomes bigger. What inference can John make? Air is matter Air is a gas. Air occupies space Air has mass None 3. What process replenishes the atmosphere with oxygen? Photosynthesis Oxygen Cycle Water Cycle Both A and C None 4. __________ is the most abundant gas in the atmosphere. Oxygen Carbon dioxide Nitrogen None of the above None 5. What is the major constituent of air Water vapour Oxygen Nitrogen Hydrogen None 6. Which one of the following gas does not form a part of the atmosphere? Carbon dioxide Oxygen Chlorine Nitrogen None 7. Which of the following gases burns in air Carbon dioxide Nitrogen Helium Carbon monoxide None 8. Which of the following gases do not form part of the atmosphere? Oxygen Nitrogen Chlorine Carbon idoxide None 9. Choose the option which justifies the given statement:-Air is considered a mixture, not a compound. It is possible to separate air into its constituent gases by physical methods like fractional distillation. Air shows properties same as the constituent gases present in it. Air does not have a fixed formula like compounds. All of the above None 10. The percentage of nitrogen and oxygen in air is: 21% by volume 37% by weight 50% by weight 99% by volume None 11. Carbon dioxide constitutes nearly ___ % of the atmosphere. 28 0.03 78 45 None 12. Air has________ composition with________ oxygen at high attitudes. fixed, more variable, less fixed, less variable, more None 13. Air is regarded as a mixture because: its composition may vary its temperature may change its pressure may vary its volume changes under different conditions None 14. Carbon exists in the atmosphere in the form of: carbon monoxide only carbon monoxide in traces and carbon dioxide coal carbon dioxide only None 15. Combustion can not take place without: zinc Air carbon water None 16. Glass panes usually appear hazy because: water vapour settling on the tiny dust particles. None they are old. it is the property of transparent substances None 17. It is not proper to breathe through our mouth because: we will catch cold easily the dust particles would enter our bodies more carbon dioxide will be inhaled our throat will become sore None 18. A greenhouse gas that absorbs energy and maintains earth's temperature is: argon nitrogen oxygen carbon dioxide None 19. Which is the most abundant gas in our atmosphere ? Carbon monoxide Carbon dioxide Oxygen Nitrogen None 20. Which of these statements are true about air?(i) Air is a mixture of several types of gases.(ii) Air exerts pressure.(iii) The composition of air is constant in the atmosphere. (i) and (iii) (i), (ii) and (iii) (i) and (ii) (ii) and (iii) None Time's up Please Share This Share this content Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Leave a Reply Cancel replyCommentEnter your name or username to commentEnter your email address to commentEnter your website URL (optional) Save my name, email, and website in this browser for the next time I comment.
